<template>
  <div>
    <span>全选:</span>
    <input type="checkbox" v-model="isAll"/>
    <button @click="Invert">反选</button>
    <ul>
      <li v-for="(obj,index) in arr" :key="index">
        <input type="checkbox" v-model="obj.c"/>
        <span>{{obj.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          c: false,
        },
        {
          name: "孙悟空",
          c: false,
        },
        {
          name: "唐僧",
          c: false,
        },
        {
          name: "白龙马",
          c: false,
        },
      ],
    };
  },
 computed: {
  //小选择影响全选
  // isAll(){
  //   return  this.arr.every(item=>item.c===true)
  //   }
  //全选完整写法
  isAll:{
    set(val){
      this.arr.forEach(obj => obj.c=val)
    },
    get(){
    return  this.arr.every(item=>item.c===true)
    }
  }
 },
 //反选
 methods: {
  Invert(){
    this.arr.forEach(obj=>obj.c=!obj.c)
  }
 }
};
</script>